Btjbneb assembly



Jan. 7, 1930. w. w. WILLIAMS BURNER ASSEMBLY Filed April 11. 1928 INVENTOR WAL TER W. WH. L /HMJ ZY @u ATTORNEY Patented Jan. 7, 1930 WALTER W. WILLIAMS, F BLOOMINGTON,

\ PATENT oFFlcE ILLINOIS, ASSIGNOR TO WILLIAMS OIL-O- MATIC HEATING CORPORATION, OF BLOOMINGTON, ILLINOIS, A CORPORATION OF ILLINOIS BURNER ASSEMBLY Application'mea April 11,

This invention relates to improvements in electrically operated liquid fuel burning de-y vices for domestic heating purposes and more particularly to what is commercially termed the burner assembly of such a device.

It is an object of this invention to provide a device of this character of the type, such as shown and described in the applicants prior Patent No. 1,637,670, August 2, 1927, in which an electric motor operates a fan blower for supplying additional air through a draft pipe surrounding a nozzle discharging a ture of liquid fuel and air from an atomizing pump also operated by said motor, with the improved burner assembly as contemplated by this invention. The pipe leading from the atomizing pump to the nozzle, the aid spiral vanes upon the nozzle, and the ignition electrodes carried upon the pipe of this type of liquid fuel burning device are commercially termed a burner assembly, inasmuch, as these parts are assembled separately and are ready for application to a new device before it leaves the factory or may be shipped separately for application or substitution for the corresponding parts upon a completed device that has left the factory or is in use. During the normal operation of this type of liquid fuel burner an emulsion or beat up mixture of oil and air is passed under pressure throughvthe burner assembly pipe and when the motor ceases to operate the burner assembly pipe behind the nozzle remains filled with this mixture and this invention contemplates the providing of a drain or oil trap into which the contents of this pipe are collected each time the motor ceases operation. Y

When the motor normally starts operation,

the electric ignition device is energized for a 1928. Serial No. 269,187. v

nected to the chamber of the atomizing pum y Figure 2 is an enlarged detail view part y in central vertical section illustrating the construction of the drain and oil trap of this improved burner assembly.

Figure 3 is a similar view taken on the line 3 3 of Figure 2.

Since this invention relates only to the burner assembly, the motor, fan blower and other parts are not illustrated. The burner assembly comprises the mixture discharge pipe 1 mounting the nozzle 2 atone end and communicating at the other end with the interior of the atomizing or mixing chamber 3. The air spiral 4 mounted on the nozzle 2 centers that end in the draft pipe 5 and the joint 6 to the mixing chamber centers the pipe 1 at the other end. The draft pipe 5 enters the combustion chamber4 of the heater to which the liquid fuel burning device is installed and continues to the rear of the burner assembly to a fan blowing housing not shown. The ignition device comprises electrode 7 and 8 held in parallel relation to the mixture pipe through the vanes of the air spiral 4, are

bent towards each other and terminate in a spark gap in front of the nozzle 2. The elect-rode 7 is insulated from the mixture pipe 1 and is connected by the lead 11 to a source of electricity while the other electrode 8 is grounded through its supporting bracket 10 to the mixture pipe 1, as shown and described in the applicants co-pendin application Serial No. 753,167, filed Decem er 1, 1924, in.

which the operation of the ignition device is described.

In order to drain the mixture pipe 1 when the mixing pump ceases operation the burner assembly is mounted Aso as to incline at a slight angle downward from the nozzle 2 and to catch the mixture as it drains therefrom a trap 1n the form of a. casing 12 is provided be-r tween the rear end of the mixture pipe 1 and the joint 6 to the mixing chamber 3. This casing 12 is provided with a bore 13 in prolongation of the mixture pipe and with which the mixture pipe is screw threaded. The rear of the bore 13 communicates through port 13, with the trap chamber 14 in the casing thereunder. If desired the ca acity of the chamber 14 may be increased y providing a forward extension in the form of a tube 15 which extends from the forward wall thereof under the mixture pipe 1, as shown. A pas- 1 sageway 16 is provided in the casing 12 leading rearwardly from one side of the bore 13 15 to the joint 6 to the mixing chamber 3.

In order that the mixture caught in the trap 14 may be removed and utilized an aspirator pipe 17 is mounted in the casing 12 centrally of the bore 13 to extend a short vdistance into the rear of the mixture pipe 1 and that end is preferably provided with a nozzle cap 18 having an opening of less'diameter. The other end of the aspirator pipe 17 com'- municates with a passageway 19 in the casing 12 which opens through a port 20 into the bottom of the trap chamber 14. It is preferthe mixture passing thereabout rom the pump towards the nozzle.'

WALTER W. WILLIAMS.

able to provide a cylindrical strainer, screen 21 extending between the upper and lower walls of the trap chamber 14 arranged concentrically'with the communicating passage tothe bore 13. The casing 12 may also be provided with screw plugs 22 and 23 which may be removed to clean the screen 21 or clear the passageway 19, if desired. IAs above stated when the motor starts the normal operation of the burner mechanism, the mixture pipe 1 will be empty. The energizing 0f the motor also energized the ignition device and the mixture pump will force a mixture of oil and air through .the mixture pipe 1 to the-nozzle 2 where it is discharged against the train of sparks passing between the electrodes 74 and 8 and theI burner becomes ignited, at the same time the passage of the mixture through pipe 1 sets up an aspirator action and empties the trap chamber 14 through the port 20, passageway 19 and aspirator pi e 17 When the motor ceases'o eration, t e mixture pump ceases, and t e drains out into the trap chamber 14, so that the mixture pipe will be empty when the motor starts operation thereafter.

What I claim is In a liquid fuel burning device including a mixture pump and a burner nozzle, a mixture pipe leading from the nozzle to the pump, a casing interplosed betweenthe said pipe and said pump aving a chamber into which the mixture in said pipe is adapted to drain when the pump ceases to operate, an

aspirator pipe arranged within the mixture pipe and communicating with the bottom of said chamber adapted to withdraw the co1- lected mixture from the chamber when the mixture remaining in the mixture pipe 1 

